Yes, it's true that AE and BE differ, but only for commas and periods. In AE they always go inside the quotation marks; in BE they go inside the quotation marks only if the quoted material is a complete sentence.

AE:He said, "This is a period."He used the word "period.""This is a comma," he said.The word "comma," despite its Greek origin, has a regular English plural.

BE:He used the term 'full stop'.He said, 'This is a full stop.''This is a comma,' he said.The word 'comma', despite its Greek origin, has a regular English plural.

In both AE and BE, all other punctuation marks go inside the quotation marks only if they are part of the quoted material. Question marks go inside only if the quotation is itself a question.

AE/BE:He asked, "Who is that?"Do you like "Gone with the Wind"?

The closed parenthesis goes outside the final punctuation mark only if the entire sentence is parenthetical.

AE/BE:The sentence was long (and boring).The sentence was really long. (It was also really boring.)

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